Change in input to make this regtest run faster

Problem due to very large values for cell vectors with nopbc

regtest/analysis/rt-mds/input.xyz

 7  
-100000. 100000. 100000.       
+100. 100. 100.       
 Ar 7.3933470660       -2.6986483924        0.0000000000
 Ar 7.8226765198       -0.7390907295        0.0000000000
 Ar 7.1014969839       -1.6164766614        0.0000000000